1. What is the most likely cause of loss of output voltage in a DC series generator?
(A) Field winding failure
(B) Armature winding failure
(C) Commutator and brush failure
(D) All of the above
2. What is the most likely cause of sparking at the brushes in a DC series generator?
(A) Field winding failure
(B) Armature winding failure
(C) All of the above
(D) Commutator and brush failure
3. What is the most likely cause of overheating of the armature in a DC series generator?
(A) Field winding failure
(B) All of the above
(C) Commutator and brush failure
(D) Armature winding failure
4. What is a possible remedy for field winding failure in a DC series generator?
(A) None of the above
(B) Check the continuity and insulation of the armature windings
(C) Clean and lubricate the commutator and brushes
(D) Check the continuity and polarity of the field windings
5. What is a possible remedy for armature winding failure in a DC series generator?
(A) Check the continuity and polarity of the field windings
(B) Check the continuity and insulation of the armature windings
(C) Clean and lubricate the commutator and brushes
(D) None of the above
6. What is a possible remedy for commutator and brush failure in a DC series generator?
(A) Check the continuity and polarity of the field windings
(B) Check the continuity and insulation of the armature windings
(C) Clean and lubricate the commutator and brushes
(D) None of the above
7. What is a symptom of reversed polarity of the field windings in a DC series generator?
(A) All of the above
(B) Sparking at the brushes
(C) Overheating of the armature
(D) Loss of output voltage
8. What is a symptom of open circuits in the armature windings in a DC series generator?
(A) Loss of output voltage
(B) All of the above
(C) Overheating of the armature
(D) Sparking at the commutator
9. What is the most likely cause of high armature current in a DC shunt generator?
(A) Loss of field excitation
(B) Loss of residual magnetism
(C) Armature reaction
(D) All of the above
10. What is the most likely cause of failure to build up voltage in a DC shunt generator?
(A) Loss of field excitation
(B) All of the above
(C) Armature reaction
(D) Loss of residual magnetism
11. What is the most likely cause of sparking at the brushes in a DC shunt generator?
(A) Loss of field excitation
(B) Loss of residual magnetism
(C) All of the above
(D) Armature reaction
12. What is a possible remedy for loss of field excitation in a DC shunt generator?
(A) Use interpoles or compensating windings to neutralize the armature reaction
(B) Restore the residual magnetism by flashing the field
(C) Check the continuity and polarity of the field windings
(D) None of the above
13. What is a possible remedy for loss of residual magnetism in a DC shunt generator?
(A) Check the continuity and polarity of the field windings
(B) None of the above
(C) Use interpoles or compensating windings to neutralize the armature reaction
(D) Restore the residual magnetism by flashing the field
14. What is a possible remedy for armature reaction in a DC shunt generator?
(A) Check the continuity and polarity of the field windings
(B) Restore the residual magnetism by flashing the field
(C) None of the above
(D) Use interpoles or compensating windings to neutralize the armature reaction
15. What is the most likely cause of loss of output voltage regulation in a DC compound generator?
(A) Differential compounding
(B) Over compounding
(C) Loss of compounding
(D) All of the above
16. What is the most likely cause of excessive output voltage rise in a DC compound generator?
(A) Over compounding
(B) Loss of compounding
(C) Differential compounding
(D) All of the above
17. What is the most likely cause of negative output voltage regulation in a DC compound generator?
(A) Loss of compounding
(B) Differential compounding
(C) Over compounding
(D) All of the above
18. What is a possible remedy for loss of compounding in a DC compound generator?
(A) None of the above
(B) Reduce the series field current
(C) Correct the connection of the series field windings
(D) Check the continuity and polarity of the series field windings